The IB Extended Essay: a parent's guide to the 4,000 word project

What the Extended Essay actually is

The Extended Essay (EE) is a 4,000 word independent research essay required of every IB Diploma candidate. Students choose a subject from their six Diploma subjects (or from a small list of approved subjects outside their personal six) and develop a research question they investigate over roughly twelve months across Years 12 and 13 (or Grades 11 and 12 in the US system). The finished essay is submitted in early January of the final year and is marked externally by IB examiners against a published criteria set.

The EE is one of the three core requirements of the Diploma, alongside Theory of Knowledge and the CAS portfolio. Together, the EE and Theory of Knowledge contribute up to three of the 45 final Diploma points through a published 3 by 3 matrix that combines the grades on each. An A grade on the EE and an A on Theory of Knowledge earns the full three bonus points. An E on either is a failing condition that prevents the Diploma being awarded at all, regardless of the rest of the transcript. The EE matters in both directions.

The IB allows EEs in 22 subjects (broadly the Diploma subjects plus a few interdisciplinary categories: world studies, language and culture, business management). Students pick the subject first, then negotiate a research question with their supervisor. Strong schools steer students towards subjects where the school has subject expertise and where the topic is researchable from the student's location. Weak schools leave the choice entirely to the student, with predictable results.

The realistic timeline

The IB publishes a recommended timeline. Strong schools tighten it. The realistic shape across the EE year is: subject selection in February to April of Year 12, supervisor matching in April to May, research question drafted in May to June, focused research in July and August (the summer between Year 12 and Year 13), first full draft in October to early November of Year 13, draft feedback in November, final draft submitted in early January of Year 13. The total student time investment runs to around 40 hours of supervised work plus substantial independent reading and writing.

The summer between Year 12 and Year 13 is where the EE makes or breaks. Students with their research question clearly defined by June use the summer to read the substantive material, gather any primary data and draft a first half of the essay. Students who finish Year 12 without a defined research question lose those eight weeks and start Year 13 in late August or early September behind. Strong schools structure the late Year 12 timetable to force the question to be set before the summer; weak schools let it slide.

For parents the practical implication is simple. The Christmas of Year 13 is the danger zone. A child who is comfortably ahead by mid November is in good shape for the January deadline. A child who has not finished the first full draft by mid November is signalling trouble. The supervisor should be raising this with the school and with parents before the autumn half term, not in the second week of December. Ask the school in October about the draft schedule, the supervisor checkpoints and the contingency for students who fall behind.

How the Extended Essay is marked

The EE is marked against five criteria, totalling 34 marks: focus and method (6 marks), knowledge and understanding (6 marks), critical thinking (12 marks), presentation (4 marks) and engagement (6 marks). The criteria are weighted: critical thinking carries the largest weighting because the EE is fundamentally testing the student's ability to construct and defend an argument from the evidence they have collected. The 34 marks convert to an A to E grade band on a published scale: A is roughly 27 marks and above, B around 21 to 26, C around 14 to 20, D around 7 to 13, E below 7. The EE is then combined with the Theory of Knowledge grade through the 3 by 3 matrix to determine the bonus points contribution.

The criterion that most candidates underperform on is critical thinking. Critical thinking, in the EE context, is the consistent application of analysis, synthesis and evaluation through the body of the essay. Students who write a description led essay (here is the topic, here is what I found, here is my conclusion) lose marks across the criterion. Students who write an argument led essay (here is my research question, here is my evidence, here is what the evidence supports and what it does not support, here is my measured conclusion) capture the higher marks. Strong supervisors push the structure towards argument; weak supervisors let it slide into description.

Engagement is the criterion most parents have not heard of. It is the IB's way of marking the student's reflective record of how the project developed. Students complete three reflective sessions with the supervisor (the Research and Reflection Sessions, often called the RPPF) and write a short reflective entry after each. Engagement is marked on these reflections. A student who treats the RPPF seriously, recording the genuine pivots and frustrations of the research, earns the marks. A student who treats it as a tick box exercise loses them. Engagement is one of the easier criteria to capture and one of the most commonly missed.

Choosing the right subject and question

The subject choice matters more than the question choice. Students who write the EE in a subject they have studied well at Higher Level have a meaningful advantage: they already know the analytical conventions of the subject, they have a base of relevant reading, and they have a teacher who knows their academic profile. Students who write the EE in a subject outside their six Diploma subjects (which the IB allows for World Studies and similar interdisciplinary categories) face a steeper hill and should only do so where the school can provide expert supervision in the chosen subject.

Within the subject, the research question should be narrow enough to answer in 4,000 words and substantial enough to allow a genuine argument. The IB publishes worked examples of strong questions, and the common pattern of strong questions is what (in a defined context), how (with a specific evidence base) and to what extent (allowing a nuanced conclusion). Weak questions are too broad (the effect of X on Y, with no defined population or period) or too descriptive (what happened in X event, with no analytical angle).

Avoid two common traps. The first is the topic the student is passionate about but where research material is thin in the school's language or library. A research question on a niche local phenomenon may be moving to write but undeliverable in 4,000 evidenced words. The second is the topic chosen because it will impress universities. Admissions tutors prefer a strong essay on a modest topic over a weak essay on a grand topic. The Cambridge admissions blog has been explicit on this point. Our wider IB curriculum explainer covers the Diploma's other core requirements.

Where parents help and where they should stay out

The IB is strict on academic honesty in the EE. The supervisor is the only person who should be giving the student substantive feedback on the content; parents, tutors and other adults should not be editing the essay. Schools require both the student and the supervisor to sign a declaration confirming this. A finished essay that reads suspiciously polished can be referred to the IB's academic integrity unit, and the consequences for a confirmed breach include the loss of the Diploma. The line is real; respect it.

That said, there is plenty parents can usefully do. Help the child manage the timeline: ask in May whether the research question has been agreed with the supervisor, ask in July whether the summer reading is happening, ask in October whether the first draft is on track. Help the child manage the project as a project: a folder structure, a reading log, a citation manager (Zotero, Mendeley) set up from the start, a backup of every draft. Help the child manage their wellbeing: the EE peaks in October to December of Year 13 when the rest of the Diploma is also peaking, and the workload can be brutal.

Stay out of the substantive feedback loop. Do not read drafts to comment on the argument. Do not suggest sources the supervisor has not approved. Do not edit the prose. The essay must be the student's. If the supervisor relationship is weak (some are), raise it with the IB coordinator at the school rather than stepping in to fill the supervisor's role yourself. The school's job is to provide adequate supervision; if it is not, the school needs to fix it.

What a strong EE school looks like

Strong IB schools structure the EE tightly. The schedule has clear checkpoints (research question approval, summer reading plan, first draft, second draft, final submission), each with a supervisor sign off. Supervisors are matched to students by subject expertise, not by availability. The school runs an in house EE workshop in late Year 12 covering research methods, citation, and the structure of an argued essay. The librarian (where present) is briefed and involved. Submissions are tracked against the schedule and parents are notified when a student is slipping.

Weak schools do none of this. The EE is announced in passing in Year 12, students are left to find a supervisor as best they can, the timeline is loose, and the first time anyone outside the family realises a student is behind is in early December when the draft does not appear. The Diploma score consequences (a 0 to 3 point swing on the bonus matrix) are real, and the difference between a strong EE school and a weak one shows up clearly in the published Diploma score distributions.

Ask the school the following questions before you commit. How many EE submissions did you have last year and what was the grade distribution. What is the supervisor to student ratio (one supervisor for one to three students is healthy; one to ten or more is thin). Do you run a structured EE workshop in Year 12 and when. What is your tracking and intervention process for students who fall behind. Which subjects in your school have the strongest EE results historically. Use our school finder to identify IB schools in your target city, and the compare tool to put up to three side by side on Diploma outcomes.

Related guides

• International Baccalaureate explained 2026
• Theory of Knowledge explained
• IB CAS for parents

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